pythonnet/Python.Runtime/pythonengine.cs at modernisation · amszwolf/pythonnet · GitHub

Repository navigation

History

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

518

519

520

521

522

523

524

525

526

527

528

529

530

531

532

533

534

535

536

537

538

539

540

541

542

543

544

545

546

547

548

549

550

551

552

553

554

555

556

557

558

559

560

561

562

563

564

565

566

567

568

569

570

571

572

573

574

575

576

577

578

579

580

581

582

583

584

585

586

587

588

589

590

591

592

593

594

595

596

597

598

599

600

601

602

603

604

605

606

607

608

609

610

611

612

613

614

615

616

617

618

619

620

621

622

623

624

625

626

627

628

629

630

631

632

633

634

635

636

637

638

639

640

641

642

643

644

645

646

647

648

649

650

651

652

653

654

655

656

657

658

659

660

661

662

663

664

665

666

667

668

669

670

671

672

673

674

675

676

677

678

679

680

681

682

683

684

685

686

687

688

689

690

691

692

693

694

695

696

697

698

699

700

701

702

703

704

705

706

707

708

709

710

711

712

713

714

715

716

717

718

719

720

721

722

723

724

725

726

727

728

729

730

731

732

733

734

735

736

737

738

739

740

741

742

743

744

745

746

747

748

749

750

751

752

753

754

755

756

757

758

759

760

761

762

763

764

765

766

767

768

769

770

771

772

773

774

775

776

777

778

779

using System.Runtime.CompilerServices;

using System.Runtime.Loader;

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Reflection;

using System.Runtime.InteropServices;

using Python.Runtime.Native;

using Python.Runtime.Interfaces;

namespace Python.Runtime

{

/// <summary>

/// This class provides the public interface of the Python runtime.

/// </summary>

public class PythonEngine : IDisposable

{

private static DelegateManager delegateManager;

private static bool initialized;

private static IntPtr _pythonHome = IntPtr.Zero;

private static IntPtr _programName = IntPtr.Zero;

private static IntPtr _pythonPath = IntPtr.Zero;

public PythonEngine()

{

Initialize();

}

public PythonEngine(params string[] args)

{

Initialize(args);

}

public PythonEngine(IEnumerable<string> args)

{

Initialize(args);

}

public void Dispose()

{

Shutdown();

}

public static bool IsInitialized

{

get { return initialized; }

}

internal static DelegateManager DelegateManager

{

get

{

if (delegateManager == null)

{

throw new InvalidOperationException(

"DelegateManager has not yet been initialized using Python.Runtime.PythonEngine.Initialize().");

}

return delegateManager;

}

public static string ProgramName

{

get

{

IntPtr p = Runtime.Py_GetProgramName();

return UcsMarshaler.PtrToPy3UnicodePy2String(p) ?? "";

}

set

{

Marshal.FreeHGlobal(_programName);

_programName = UcsMarshaler.Py3UnicodePy2StringtoPtr(value);

Runtime.Py_SetProgramName(_programName);

}

public static string PythonHome

{

get

{

IntPtr p = Runtime.Py_GetPythonHome();

return UcsMarshaler.PtrToPy3UnicodePy2String(p) ?? "";

}

set

{

Marshal.FreeHGlobal(_pythonHome);

_pythonHome = UcsMarshaler.Py3UnicodePy2StringtoPtr(value);

Runtime.Py_SetPythonHome(_pythonHome);

}

public static string PythonPath

{

get

{

IntPtr p = Runtime.Py_GetPath();

return UcsMarshaler.PtrToPy3UnicodePy2String(p) ?? "";

}

set

{

#if PYTHON2

throw new NotSupportedException("Set PythonPath not supported on Python 2");

#else

Marshal.FreeHGlobal(_pythonPath);

_pythonPath = UcsMarshaler.Py3UnicodePy2StringtoPtr(value);

Runtime.Py_SetPath(_pythonPath);

#endif

}

public static string Version

{

get { return Marshal.PtrToStringAnsi(Runtime.Py_GetVersion()); }

}

public static string BuildInfo

{

get { return Marshal.PtrToStringAnsi(Runtime.Py_GetBuildInfo()); }

}

public static string Copyright

{

get { return Marshal.PtrToStringAnsi(Runtime.Py_GetCopyright()); }

}

public static string Compiler

{

get { return Marshal.PtrToStringAnsi(Runtime.Py_GetCompiler()); }

}

/// <summary>

/// Set the NoSiteFlag to disable loading the site module.

/// Must be called before Initialize.

/// https://docs.python.org/3/c-api/init.html#c.Py_NoSiteFlag

/// </summary>

public static void SetNoSiteFlag()

{

Runtime.SetNoSiteFlag();

}

public static int RunSimpleString(string code)

{

return Runtime.PyRun_SimpleString(code);

}

public static void Initialize()

{

Initialize(setSysArgv: true);

}

public static void Initialize(bool setSysArgv = true, bool initSigs = false)

{

Initialize(Enumerable.Empty<string>(), setSysArgv: setSysArgv, initSigs: initSigs);

}

/// <summary>

/// Initialize Method

/// </summary>

/// <remarks>

/// Initialize the Python runtime. It is safe to call this method

/// more than once, though initialization will only happen on the

/// first call. It is *not* necessary to hold the Python global

/// interpreter lock (GIL) to call this method.

/// initSigs can be set to 1 to do default python signal configuration. This will override the way signals are handled by the application.

/// </remarks>

public static void Initialize(IEnumerable<string> args, bool setSysArgv = true, bool initSigs = false)

{

if (!initialized)

{

// Creating the delegateManager MUST happen before Runtime.Initialize

// is called. If it happens afterwards, DelegateManager's CodeGenerator

// throws an exception in its ctor. This exception is eaten somehow

// during an initial "import clr", and the world ends shortly thereafter.

// This is probably masking some bad mojo happening somewhere in Runtime.Initialize().

delegateManager = new DelegateManager();

Runtime.Initialize(initSigs);

initialized = true;

Exceptions.Clear();

// Make sure we clean up properly on app domain unload.

AppDomain.CurrentDomain.DomainUnload += OnDomainUnload;

// Remember to shut down the runtime.

AddShutdownHandler(Runtime.Shutdown);

// The global scope gets used implicitly quite early on, remember

// to clear it out when we shut down.

AddShutdownHandler(PyScopeManager.Global.Clear);

if (setSysArgv)

{

Py.SetArgv(args);

}

// register the atexit callback (this doesn't use Py_AtExit as the C atexit

// callbacks are called after python is fully finalized but the python ones

// are called while the python engine is still running).

string code =

"import atexit, clr\n" +

"atexit.register(clr._AtExit)\n";

PythonEngine.Exec(code);

// Load the clr.py resource into the clr module

IntPtr clr = Python.Runtime.ImportHook.GetCLRModule();

IntPtr clr_dict = Runtime.PyModule_GetDict(clr);

var locals = new PyDict();

try

{

IntPtr module = Runtime.PyImport_AddModule("clr._extras");

IntPtr module_globals = Runtime.PyModule_GetDict(module);

IntPtr builtins = Runtime.PyEval_GetBuiltins();

Runtime.PyDict_SetItemString(module_globals, "__builtins__", builtins);

Assembly assembly = Assembly.GetExecutingAssembly();

using (Stream stream = assembly.GetManifestResourceStream("clr.py"))

using (var reader = new StreamReader(stream))

{

// add the contents of clr.py to the module

string clr_py = reader.ReadToEnd();

Exec(clr_py, module_globals, locals.Handle);

}

// add the imported module to the clr module, and copy the API functions

// and decorators into the main clr module.

Runtime.PyDict_SetItemString(clr_dict, "_extras", module);

foreach (PyObject key in locals.Keys())

{

if (!key.ToString().StartsWith("_") || key.ToString().Equals("__version__"))

{

PyObject value = locals[key];

Runtime.PyDict_SetItem(clr_dict, key.Handle, value.Handle);

value.Dispose();

}

key.Dispose();

}

finally

{

locals.Dispose();

}

static void OnDomainUnload(object _, EventArgs __)

{

Shutdown();

}

/// <summary>

/// A helper to perform initialization from the context of an active

/// CPython interpreter process - this bootstraps the managed runtime

/// when it is imported by the CLR extension module.

/// </summary>

public static int InternalInitialize(IntPtr data, int size)

{

try

{

Console.WriteLine("Running on {0}", RuntimeInformation.FrameworkDescription);

var ass = Platform.InternalLoadContext.Instance.LoadFromAssemblyName(new AssemblyName("Python.Runtime.Native"));

var typ = ass.GetType("Python.Runtime.Native.LibPythonPInvoke");

Runtime.LibPython = (ILibPython)Activator.CreateInstance(typ);

Initialize(setSysArgv: false);

// Trickery - when the import hook is installed into an already

// running Python, the standard import machinery is still in

// control for the duration of the import that caused bootstrap.

// That is problematic because the std machinery tries to get

// sub-names directly from the module __dict__ rather than going

// through our module object's getattr hook. This workaround is

// evil ;) We essentially climb up the stack looking for the

// import that caused the bootstrap to happen, then re-execute

// the import explicitly after our hook has been installed. By

// doing this, the original outer import should work correctly.

// Note that this is only needed during the execution of the

// first import that installs the CLR import hook. This hack

// still doesn't work if you use the interactive interpreter,

// since there is no line info to get the import line ;(

// Console.WriteLine("Initialized");

// Console.Out.Flush();

string code =

"import traceback\n" +

"for item in traceback.extract_stack():\n" +

" line = item[3]\n" +

" if line is not None:\n" +

" if line.startswith('import CLR') or \\\n" +

" line.startswith('import clr') or \\\n" +

" line.startswith('from clr') or \\\n" +

" line.startswith('from CLR'):\n" +

" exec(line)\n" +

" break\n";

PythonEngine.Exec(code);

// Console.WriteLine("Exec'd traceback hack");

// Console.Out.Flush();

return 0;

}

catch (PythonException e)

{

e.Restore();

return -1;

}

catch (Exception e)

{

Console.Error.WriteLine(e.ToString());

Console.Error.Write(e.StackTrace);

return -2;

}

/// <summary>

/// Shutdown Method

/// </summary>

/// <remarks>

/// Shutdown and release resources held by the Python runtime. The

/// Python runtime can no longer be used in the current process

/// after calling the Shutdown method.

/// </remarks>

public static void Shutdown()

{

if (initialized)

{

PyScopeManager.Global.Clear();

// If the shutdown handlers trigger a domain unload,

// don't call shutdown again.

AppDomain.CurrentDomain.DomainUnload -= OnDomainUnload;

ExecuteShutdownHandlers();

initialized = false;

}

/// <summary>

/// Called when the engine is shut down.

///

/// Shutdown handlers are run in reverse order they were added, so that

/// resources available when running a shutdown handler are the same as

/// what was available when it was added.

/// </summary>

public delegate void ShutdownHandler();

static List<ShutdownHandler> ShutdownHandlers = new List<ShutdownHandler>();

/// <summary>

/// Add a function to be called when the engine is shut down.

///

/// Shutdown handlers are executed in the opposite order they were

/// added, so that you can be sure that everything that was initialized

/// when you added the handler is still initialized when you need to shut

/// down.

///

/// If the same shutdown handler is added several times, it will be run

/// several times.

///

/// Don't add shutdown handlers while running a shutdown handler.

/// </summary>

public static void AddShutdownHandler(ShutdownHandler handler)

{

ShutdownHandlers.Add(handler);

}

/// <summary>

/// Remove a shutdown handler.

///

/// If the same shutdown handler is added several times, only the last

/// one is removed.

///

/// Don't remove shutdown handlers while running a shutdown handler.

/// </summary>

public static void RemoveShutdownHandler(ShutdownHandler handler)

{

for (int index = ShutdownHandlers.Count - 1; index >= 0; --index)

{

if (ShutdownHandlers[index] == handler)

{

ShutdownHandlers.RemoveAt(index);

break;

}

/// <summary>

/// Run all the shutdown handlers.

///

/// They're run in opposite order they were added.

/// </summary>

static void ExecuteShutdownHandlers()

{

while(ShutdownHandlers.Count > 0)

{

var handler = ShutdownHandlers[ShutdownHandlers.Count - 1];

ShutdownHandlers.RemoveAt(ShutdownHandlers.Count - 1);

handler();

}

/// <summary>

/// AcquireLock Method

/// </summary>

/// <remarks>

/// Acquire the Python global interpreter lock (GIL). Managed code

/// *must* call this method before using any objects or calling any

/// methods on objects in the Python.Runtime namespace. The only

/// exception is PythonEngine.Initialize, which may be called without

/// first calling AcquireLock.

/// Each call to AcquireLock must be matched by a corresponding call

/// to ReleaseLock, passing the token obtained from AcquireLock.

/// For more information, see the "Extending and Embedding" section

/// of the Python documentation on www.python.org.

/// </remarks>

public static IntPtr AcquireLock()

{

return Runtime.PyGILState_Ensure();

}

/// <summary>

/// ReleaseLock Method

/// </summary>

/// <remarks>

/// Release the Python global interpreter lock using a token obtained

/// from a previous call to AcquireLock.

/// For more information, see the "Extending and Embedding" section

/// of the Python documentation on www.python.org.

/// </remarks>

public static void ReleaseLock(IntPtr gs)

{

Runtime.PyGILState_Release(gs);

}

/// <summary>

/// BeginAllowThreads Method

/// </summary>

/// <remarks>

/// Release the Python global interpreter lock to allow other threads

/// to run. This is equivalent to the Py_BEGIN_ALLOW_THREADS macro

/// provided by the C Python API.

/// For more information, see the "Extending and Embedding" section

/// of the Python documentation on www.python.org.

/// </remarks>

public static IntPtr BeginAllowThreads()

{

return Runtime.PyEval_SaveThread();

}

/// <summary>

/// EndAllowThreads Method

/// </summary>

/// <remarks>

/// Re-aquire the Python global interpreter lock for the current

/// thread. This is equivalent to the Py_END_ALLOW_THREADS macro

/// provided by the C Python API.

/// For more information, see the "Extending and Embedding" section

/// of the Python documentation on www.python.org.

/// </remarks>

public static void EndAllowThreads(IntPtr ts)

{

Runtime.PyEval_RestoreThread(ts);

}

/// <summary>

/// ImportModule Method

/// </summary>

/// <remarks>

/// Given a fully-qualified module or package name, import the

/// module and return the resulting module object as a PyObject

/// or null if an exception is raised.

/// </remarks>

public static PyObject ImportModule(string name)

{

IntPtr op = Runtime.PyImport_ImportModule(name);

Runtime.CheckExceptionOccurred();

return new PyObject(op);

}

/// <summary>

/// ReloadModule Method

/// </summary>

/// <remarks>

/// Given a PyObject representing a previously loaded module, reload

/// the module.

/// </remarks>

public static PyObject ReloadModule(PyObject module)

{

IntPtr op = Runtime.PyImport_ReloadModule(module.Handle);

Runtime.CheckExceptionOccurred();

return new PyObject(op);

}

/// <summary>

/// ModuleFromString Method

/// </summary>

/// <remarks>

/// Given a string module name and a string containing Python code,

/// execute the code in and return a module of the given name.

/// </remarks>

public static PyObject ModuleFromString(string name, string code)

{

IntPtr c = Runtime.Py_CompileString(code, "none", (IntPtr)257);

Runtime.CheckExceptionOccurred();

IntPtr m = Runtime.PyImport_ExecCodeModule(name, c);

Runtime.CheckExceptionOccurred();

return new PyObject(m);

}

public static PyObject Compile(string code, string filename = "", RunFlagType mode = RunFlagType.File)

{

var flag = (IntPtr)mode;

IntPtr ptr = Runtime.Py_CompileString(code, filename, flag);

Runtime.CheckExceptionOccurred();

return new PyObject(ptr);

}

/// <summary>

/// Eval Method

/// </summary>

/// <remarks>

/// Evaluate a Python expression and returns the result.

/// It's a subset of Python eval function.

/// </remarks>

public static PyObject Eval(string code, IntPtr? globals = null, IntPtr? locals = null)

{

PyObject result = RunString(code, globals, locals, RunFlagType.Eval);

return result;

}

/// <summary>

/// Exec Method

/// </summary>

/// <remarks>

/// Run a string containing Python code.

/// It's a subset of Python exec function.

/// </remarks>

public static void Exec(string code, IntPtr? globals = null, IntPtr? locals = null)

{

PyObject result = RunString(code, globals, locals, RunFlagType.File);

if (result.obj != Runtime.PyNone)

{

throw new PythonException();

}

result.Dispose();

}

/// <summary>

/// RunString Method. Function has been deprecated and will be removed.

/// Use Exec/Eval/RunSimpleString instead.

/// </summary>

[Obsolete("RunString is deprecated and will be removed. Use Exec/Eval/RunSimpleString instead.")]

public static PyObject RunString(string code, IntPtr? globals = null, IntPtr? locals = null)

{

return RunString(code, globals, locals, RunFlagType.File);

}

/// <summary>

/// Internal RunString Method.

/// </summary>

/// <remarks>

/// Run a string containing Python code. Returns the result of

/// executing the code string as a PyObject instance, or null if

/// an exception was raised.

/// </remarks>

internal static PyObject RunString(string code, IntPtr? globals, IntPtr? locals, RunFlagType flag)

{

var borrowedGlobals = true;

if (globals == null)

{

globals = Runtime.PyEval_GetGlobals();

if (globals == IntPtr.Zero)

{

globals = Runtime.PyDict_New();

Runtime.PyDict_SetItemString(

globals.Value, "__builtins__",

Runtime.PyEval_GetBuiltins()

);

borrowedGlobals = false;

}

if (locals == null)

{

locals = globals;

}

try

{

IntPtr result = Runtime.PyRun_String(

code, (IntPtr)flag, globals.Value, locals.Value

);

Runtime.CheckExceptionOccurred();

return new PyObject(result);

}

finally

{

if (!borrowedGlobals)

{

Runtime.XDecref(globals.Value);

}

public enum RunFlagType

{

Single = 256,

File = 257, /* Py_file_input */

Eval = 258

}

public static class Py

{

public static GILState GIL()

{

if (!PythonEngine.IsInitialized)

{

PythonEngine.Initialize();

}

return new GILState();

}

public static PyScope CreateScope()

{

var scope = PyScopeManager.Global.Create();

return scope;

}

public static PyScope CreateScope(string name)

{

var scope = PyScopeManager.Global.Create(name);

return scope;

}

public class GILState : IDisposable

{

private IntPtr state;

internal GILState()

{

state = PythonEngine.AcquireLock();

}

public void Dispose()

{

PythonEngine.ReleaseLock(state);

GC.SuppressFinalize(this);

}

~GILState()

{

Dispose();

}

public class KeywordArguments : PyDict

{

}

public static KeywordArguments kw(params object[] kv)

{

var dict = new KeywordArguments();

if (kv.Length % 2 != 0)

{

throw new ArgumentException("Must have an equal number of keys and values");

}

for (var i = 0; i < kv.Length; i += 2)

{

IntPtr value;

if (kv[i + 1] is PyObject)

{

value = ((PyObject)kv[i + 1]).Handle;

}

else

{

value = Converter.ToPython(kv[i + 1], kv[i + 1]?.GetType());

}

if (Runtime.PyDict_SetItemString(dict.Handle, (string)kv[i], value) != 0)

{

throw new ArgumentException(string.Format("Cannot add key '{0}' to dictionary.", (string)kv[i]));

}

if (!(kv[i + 1] is PyObject))

{

Runtime.XDecref(value);

}

return dict;

}

public static PyObject Import(string name)

{

return PythonEngine.ImportModule(name);

}

public static void SetArgv()

{

IEnumerable<string> args;

try

{

args = Environment.GetCommandLineArgs();

}

catch (NotSupportedException)

{

args = Enumerable.Empty<string>();

}

SetArgv(

new[] { "" }.Concat(

Environment.GetCommandLineArgs().Skip(1)

)

);

}

public static void SetArgv(params string[] argv)

{

SetArgv(argv as IEnumerable<string>);

}

public static void SetArgv(IEnumerable<string> argv)

{

using (GIL())

{

string[] arr = argv.ToArray();

Runtime.PySys_SetArgvEx(arr.Length, arr, 0);

Runtime.CheckExceptionOccurred();

}

public static void With(PyObject obj, Action<dynamic> Body)

{

// Behavior described here:

// https://docs.python.org/2/reference/datamodel.html#with-statement-context-managers

IntPtr type = Runtime.PyNone;

IntPtr val = Runtime.PyNone;

IntPtr traceBack = Runtime.PyNone;

PythonException ex = null;

try

{

PyObject enterResult = obj.InvokeMethod("__enter__");

Body(enterResult);

}

catch (PythonException e)

{

ex = e;

type = ex.PyType;

val = ex.PyValue;

traceBack = ex.PyTB;

}

var exitResult = obj.InvokeMethod("__exit__", new PyObject(type), new PyObject(val), new PyObject(traceBack));

if (ex != null && !exitResult.IsTrue()) throw ex;

}

pythonnet/Python.Runtime/pythonengine.cs at modernisation · amszwolf/pythonnet · GitHub

Repository navigation

Expand file tree

Breadcrumbs

pythonengine.cs

Latest commit

History

Breadcrumbs

pythonengine.cs

File metadata and controls